Most Lipo battery chargers have a Storage mode. If you dont plan on using them in the next few days it is always best to bring your batteries down or up to storage voltage (approx 3.8v per cell). Team Exalt 1S Shorty LCG LiPo Battery Storage Case [EXA4052] HobbyTown LiPo Charging and Storage Safe TT9703 LiPo Guard Large Battery Bag (295x230mm) for Charging and Storage for R C or RC Team Integy How to Safely Store LiPo Batteries: Avoid Fires EXHOBBY Lipo C Tablet, Sodium Ascorbate 200mg at 30 box in Pondicherry ID: 22379724697